6家医院碘治疗场所工作人员甲状腺131I活度测量

目的调查碘治疗场所工作人员甲状腺131I活度水平及其主要影响因素。方法采用配额抽样的方法, 按照碘治疗场所医院的不同类型, 在山西省和山东省共选择6家开展碘治疗的医院, 采用直接测量法, 对76名碘治疗场所工作人员的甲状腺131I活度进行了测量, 并进行内照射剂量估算。结果共有5家医院的29人甲状腺131I活度高于仪器的探测限, 占全部被检测人员的38.16%, 其中最高值为2 468.45 Bq, 是1名负责手动分装放射性碘的医师。6家医院碘治疗场所工作人员甲状腺131I活度差异无统计学意义(P>0.05), 但手动分装131I的医院测量结果高于自动分装的医院, 差异有统计学意义(Z=1.75, P<0.01), 两家手动分装131I医院的12名碘治疗场所工作人员甲状腺测量结果全部高于探测限, 中位数分别为324.59 Bq和331.98 Bq, 4家使用自动分装仪的医院测量结果的中位数均低于探测限, 甲状腺131I检出率分别为32.61%、25.00%、10.00%和0。对于同一家医院, 参与分装131I的医生和保洁人员甲状腺131I活度高于不参与分装的医生, 差异有统...

Measurement of 131I activity in thyroid of workers at the place of radioiodine therapy in six hospitals

Objective To investigate ¹³¹I activity in thyroid of workers at the place of radioiodine therapy and its main influencing factors.Methods In terms of the types of hospitals, six hospitals that performed radioiodine therapy procedure were selected by quota sampling in the provinces of Shandong and Shanxi. ¹³¹I activity in thyroids of 76 workers at the place of radioiodine therapy was measured directly, and their internal doses were estimated.Results ¹³¹I activity in thyroids was found to be above the detection limit for 29 subjects (38.16%) in five hospitals. The maximum value of ¹³¹I activity was 2 468.45 Bq for a doctor who was responsible for manual distribution of radioisotopes. In general ¹³¹I activities in thyroid of workers at the place of radioiodine therapy of six hospitals were not significantly different (P > 0.05). But the measurement result in the hospitals where radioiodine was distributed manually were significantly higher than that in the hospitals where radioiodine was distributed automatically (Z=1.75, P < 0.01). Thyroid measurement result of 12 workers in two hospitals where radioiodine was distributed manually were all above the detection limit, with medians of 324.59 Bq and 331.98 Bq, respectively. The medians of ¹³¹I activities in thyroid of 12 staff in the remaining 4 hospitals were all below the detection limit. The detection frequencies of ¹³¹I above dose limit were 32.61%, 25.00%, 10.00% and 0. The measurement result for the doctors who participated in distributing ¹³¹I and the relevent cleaners were significantly higher than for the doctors who did not participate in distributing ¹³¹I at the same hospital (Z=2.44, 2.12, P < 0.05).Conclusions There was a significant difference in the internal exposure level among workers at the different places of radioiodine therapy. Using automatic loading device could reduce the internal exposure level of the workers at the place of radioiodine therapy. It is necessary to strengthen the radiological protection for workers at the control area of the place of radioiodine therapy.